LaMotte HUMUS SCREENING TEST STH-1 - Manual (Page 2)

PRO CE DURE
1. Use the 0.5 g spoon (0698) to add eight level measures of soil to a test
tube (0704).
2. Fill extraction tube to the 14 mL line with Deionized Water or tap
water.
3. Use the 0.5 g spoon (0698) to add 2 level measures of *Humus
Screening Reagent Powder (5119) to the soil-water mixture. If
necessary, add more water to the tube to bring the level of the
solution back up to the 14 mL line.
4. Cap the tube and shake vigorously for one minute.
5. Add 15 drops of Soil Flocculating Reagent (5643). Cap and mix
gently. Allow to settle for several minutes.
6. Filter the solution into a second extraction tube as follows:
Fold a sheet of filter paper (0465) in half, forming a semi-circle. Fold
in half again to form cone. Opening the filter paper cone, fit it into
the funnel (0459) and place the tip of the funnel into an empty
extraction tube (0704). Steadying the funnel and filter paper with
one hand, slowly pour the solution from Step 5 into the filter paper
cone.
7. Hold the tube against the white area of the color chart. Compare the
clear filtrate in the second extraction tube to the Humus Color Chart
(1384).
IN TER PRE TA TION
The Humus Color Chart (1384) is labeled with values of 1, 2, 3, 4 and 5.
The results are interpreted as follows:
HUMUS OR ORGANIC MATTER IN SOIL
Humus Reading 1 2 3 4 5
Agricultural Soils Low Medium High
Garden-Greenhouse Soils Low Medium High
Organic Soils Low Medium High
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